mcs/class/Npgsql/Npgsql/Design/NpgsqlParameterConverter.cs

   1 using System;
   2 using System.ComponentModel;
   3 using System.ComponentModel.Design.Serialization;
   4 using System.Data;
   5 using System.Reflection;
   6
   7 namespace Npgsql.Design
   8 {
   9         /// <summary>
  10         /// Zusammenfassung fr NpgsqlParameterConverter.
  11         /// </summary>
  12         internal class NpgsqlParameterConverter : ExpandableObjectConverter
  13         {
  14                 public NpgsqlParameterConverter()
  15                 {
  16                         //
  17                         // TODO: Fgen Sie hier die Konstruktorlogik hinzu
  18                         //
  19                 }
  20
  21                 public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType) {
  22                         if (destinationType == typeof(InstanceDescriptor))
  23                                 return true;
  24                         return base.CanConvertTo (context, destinationType);
  25                 }
  26
  27                 public override object ConvertTo(ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value, Type destinationType) {
  28                         if(destinationType == null){
  29                                 throw new ArgumentNullException("destinationType");
  30                         }
  31                         if(destinationType == typeof(InstanceDescriptor) && value as NpgsqlParameter != null){
  32                                 NpgsqlParameter param = (NpgsqlParameter)value;
  33                                 bool DbTypeChanged = false;
  34                                 bool OtherChanged = false;
  35                                 bool SizeChanged = false;
  36                                 bool SourceColumnChanged = false;
  37                                 bool ValueChanged = false;
  38                                 if(param.DbType != DbType.String){
  39                                         DbTypeChanged= true;
  40                                 }
  41                                 if(param.Direction != ParameterDirection.Input || param.Precision != 0 || param.Scale != 0 || param.SourceVersion != DataRowVersion.Current || param.IsNullable == true){
  42                                         OtherChanged = true;
  43                                 }
  44                                 if(param.Size != 0){
  45                                         SizeChanged = true;
  46                                 }
  47                                 if(param.SourceColumn == null || param.SourceColumn.Trim() != String.Empty){
  48                                         SourceColumnChanged = true;
  49                                 }
  50                                 if(param.Value != null){
  51                                         ValueChanged = true;
  52                                 }
  53
  54                                 if(!(OtherChanged || SizeChanged || SourceColumnChanged || ValueChanged)){
  55                                         ConstructorInfo ci = typeof(NpgsqlParameter).GetConstructor(new Type[]{typeof(String), typeof(DbType)});
  56                                         if (ci != null){
  57                                                 return new InstanceDescriptor(ci, new Object[]{param.ParameterName, param.DbType});
  58                                         }
  59                                 }else if(!(OtherChanged || SourceColumnChanged || ValueChanged)){
  60                                         ConstructorInfo ci = typeof(NpgsqlParameter).GetConstructor(new Type[]{typeof(String), typeof(DbType), typeof(Int32)});
  61                                         if (ci != null){
  62                                                 return new InstanceDescriptor(ci, new Object[]{param.ParameterName, param.DbType, param.Size});
  63                                         }
  64                                 }else if(!(OtherChanged || ValueChanged)){
  65                                         ConstructorInfo ci = typeof(NpgsqlParameter).GetConstructor(new Type[]{typeof(String), typeof(DbType), typeof(Int32), typeof(String)});
  66                                         if (ci != null){
  67                                                 return new InstanceDescriptor(ci, new Object[]{param.ParameterName, param.DbType, param.Size, param.SourceColumn});
  68                                         }
  69                                 }else if(ValueChanged && !DbTypeChanged){
  70                                         ConstructorInfo ci = typeof(NpgsqlParameter).GetConstructor(new Type[]{typeof(String), typeof(Object)});
  71                                         if (ci != null){
  72                                                 return new InstanceDescriptor(ci, new Object[]{param.ParameterName, param.Value});
  73                                         }
  74                                 }else{
  75                                         ConstructorInfo ci = typeof(NpgsqlParameter).GetConstructor(new Type[]{typeof(String), typeof(DbType), typeof(Int32), typeof(String), typeof(ParameterDirection), typeof(Boolean), typeof(Byte), typeof(Byte), typeof(DataRowVersion), typeof(Object)});
  76                                         if (ci != null){
  77                                                 return new InstanceDescriptor(ci, new Object[]{param.ParameterName, param.DbType, param.Size, param.SourceColumn, param.Direction, param.IsNullable, param.Precision, param.Scale, param.SourceVersion, param.Value});
  78                                         }
  79                                 }
  80                         }
  81                         return base.ConvertTo (context, culture, value, destinationType);
  82                 }
  83         }
  84 }